Pleasant Young Woman 1 (PYW 1): You look very studious.
Sheldon (looking up): Yes ... How can I help you?
PYW 2: And even taking notes.
Sheldon: Yes. What can I do for you?
PYW 1 and PYW 2 (in unison): We're missionaries.
"Oh," I said. "What church?"
PYW 2: The Church of Jesus Christ of Latter Day Saints.
"Oh, the Mormons," I said.
"Yes," said one of them. "Do you know about the Mormons?"
"There was that musical."
"Did you see it?"
"No. The Mormons also play a central role in the first Sherlock Holmes story."
PYW 1: Really?
"Yes. Have you read any Sherlock Holmes stories?"
PYW 1: Yes, but obviously not the first one.
Sheldon: A Study in Scarlet.
PYW 1: Is it any good?
"Oh, very good," I said, though I suddenly thought, Perhaps it doesn't portray Mormons in a very favourable light. They won't like that. Still, at least I was able to tell these Mormons something about themselves that they didn't know before. Performing an act of service, you might call it.
Anyway, at this point I got up to leave, saying cheerily (I'd been cheery throughout) that I had to be on my way.
PYW 1 seemed to accept this, perhaps picking up the signals that I was not good fodder for recruitment despite my cheeriness. PYW 2, however, persisted.
"Would you like to visit our church?" she said. "It's right nearby."
"Thanks," I said, "but I have to be on my way."
And that was Sheldon's encounter with the Mormons.